Marilyn has experienced one bout of major depressive disorder. there is a 50 percent chance that she will experience another episode within two years of this bout and that the relapse will be severe and the time between her episodes will

relapse will be "more" severe and the time between her episodes will "decrease".

Major depressive disorder, is described by a relentless sentiment misery or an absence of enthusiasm for outside jolts. The unipolar means a contrast between significant misery and bipolar sadness, which alludes to a swaying state amongst gloom and lunacy. Rather, unipolar dejection is exclusively centered around the "lows," or the negative feelings and side effects that you may have encountered. 

Pilgrims is the answer